CN103313773A - Electrically heated catalyst - Google Patents
Electrically heated catalyst Download PDFInfo
- Publication number
- CN103313773A CN103313773A CN2012800003969A CN201280000396A CN103313773A CN 103313773 A CN103313773 A CN 103313773A CN 2012800003969 A CN2012800003969 A CN 2012800003969A CN 201280000396 A CN201280000396 A CN 201280000396A CN 103313773 A CN103313773 A CN 103313773A
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- China
- Prior art keywords
- inner tube
- rake
- tube
- housing
- exhaust
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
- F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
- F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
- F01N3/18—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control
- F01N3/20—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control specially adapted for catalytic conversion ; Methods of operation or control of catalytic converters
- F01N3/2006—Periodically heating or cooling catalytic reactors, e.g. at cold starting or overheating
- F01N3/2013—Periodically heating or cooling catalytic reactors, e.g. at cold starting or overheating using electric or magnetic heating means
- F01N3/2026—Periodically heating or cooling catalytic reactors, e.g. at cold starting or overheating using electric or magnetic heating means directly electrifying the catalyst substrate, i.e. heating the electrically conductive catalyst substrate by joule effect
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
- F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
- F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
- F01N3/24—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by constructional aspects of converting apparatus
- F01N3/28—Construction of catalytic reactors
- F01N3/2839—Arrangements for mounting catalyst support in housing, e.g. with means for compensating thermal expansion or vibration
- F01N3/2853—Arrangements for mounting catalyst support in housing, e.g. with means for compensating thermal expansion or vibration using mats or gaskets between catalyst body and housing
- F01N3/2864—Arrangements for mounting catalyst support in housing, e.g. with means for compensating thermal expansion or vibration using mats or gaskets between catalyst body and housing the mats or gaskets comprising two or more insulation layers
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/12—Improving ICE efficiencies
Abstract
This electrically heated catalyst keeps electricity from flowing in the case (5) of the electrically heated catalyst (1). To that effect, the case (5), which houses a heating element (3), is provided with a tubular portion (53) formed parallel to a central axis, an entrance portion (51) provided further upstream than the tubular portion (53) and having an inner diameter smaller than that of the tubular portion (53), an inclined portion (52) which connects the tubular portion (53) and the entrance portion (51), and an introduction portion (54) which extends to inside the case (5) from where the entrance portion (51) and the inclined portion (52) connect and which is curved such that the center of curvature is positioned outside of the case (5). An inner cylinder (4), which is held from both sides by a mat (6) supporting the heating element (3), is provided with a cylindrical portion (42) formed parallel to the central axis, and an inclined portion (41) which is provided further upstream than the cylindrical portion (42), has an inner diameter that becomes smaller in the upstream direction and is curved.
Description
Technical field
The present invention relates to the electrical heating type catalyst.
Background technology
As the exhaust emission control catalyst in the exhaust channel that is arranged at internal combustion engine, developed and used by being energized the electrical heating type catalyst that the heater that generates heat heats catalyst (Electrically Heated Catalyst: below, sometimes be also referred to as EHC).
And, known (for example have following technology, with reference to patent documentation 1): in the housing of containing catalyst, use the liner supporting catalyst, the arranged outside that the inner tube of electric insulation part is sandwiched in this liner catalyst is bimetallic tube, and more upstream side and downstream are outstanding than liner to make this inner tube.
And, known following technology (for example, with reference to patent documentation 2): lean on the housing of the position containing catalyst in upstream side and downstream to be set to taper than catalyst, and in the position of this taper, forming the bimetallic tube of upstream side sealing downstream opening.
By above-mentioned bimetallic tube, even adhere to condensate water or particulate material (below, be also referred to as PM), also can guarantee insulating properties to a certain degree.But according to the direction of exhaust flow, PM might adhere to, so insulating properties might descend.Thus, in the housing current flowing might be arranged.
Technical literature formerly
Patent documentation
Patent documentation 1:WO2011/121710 communique
Patent documentation 2:WO2011/128996 communique
Summary of the invention
The problem to be solved in the present invention
The present invention makes in view of the above problems, and its purpose is to suppress electric current and flows in the housing of electrical heating type catalyst.
For the means of dealing with problems
In order to address the above problem, the present invention is a kind of electrical heating type catalyst, comprising:
Heater, this heater generates heat by being energized;
Housing, this housing holds described heater;
Liner, this liner are arranged between described housing and the described heater, and support described heater; And
Inner tube, this inner tube is outstanding by described liner clamping and the upstream side from described liner to exhaust flow and downstream, and described inner tube electric insulation;
Wherein, described housing comprises: tube, and this tube is arranged on the outer circumferential side of described heater, and forms with the central axes of described heater ground; Inlet portion, this inlet portion are arranged on the position of more leaning on upstream side than described tube, and the internal diameter of described inlet portion is less than the internal diameter of described tube; Rake, this rake connect described tube and described inlet portion, and more rely on the downstream, and the sectional area of described rake is just larger; And introduction part, extend the inboard of this introduction part from the connecting portion between described inlet portion and the described rake to described housing,
Described introduction part so that the center of curvature to be positioned at the mode in the outside of described introduction part crooked,
Described inner tube comprises: tube, and this tube is arranged on the outer circumferential side of described heater, and forms with the central axes of described heater ground; And rake, this rake is arranged on than described tube and more leans on the position of upstream side, and more relies on upstream side, and the internal diameter of described rake is just less,
The rake of described inner tube is crooked.
Heater also can be used as the carrier of catalyst, also can be arranged on than the position of catalyst by upstream side.By switching on to heater, this heater generates heat, and therefore can improve the temperature of catalyst.In addition, on the flow direction of exhaust, liner is than short with inner tube.Therefore, inner tube is outstanding to upstream side and the downstream of the flow direction of exhaust from medial pad and outer liner.In addition, housing also can be used as the outer tube of bimetallic tube.That is, also can form bimetallic tube by housing and inner tube.And liner is arranged on the inboard of the tube of housing, and the tube of clamping inner tube.At this, the rake of inner tube also can be parallel with the rake of housing.
And by at housing introduction part being set, exhaust is suppressed to the diffusion between inner tube and the housing, therefore can suppress exhaust and flow between housing and the inner tube.In addition, introduction part is towards the outside curve of this introduction part.It is the side away from central shaft in this said outside.That is, more rely on the downstream, the distance of introduction part and central shaft is just longer, so the sectional area of introduction part is just larger.Therefore, spread laterally the limit by the exhaust limit after in the introduction part and advance, know to arrive to heater.Therefore, can make exhaust more mobile to the wide scope of heater.And, can reduce thus the amount that the exhaust of adverse current occurs with the upstream-side-end collision of heater.
At this, the part of exhaust and the upstream-side-end of heater are collided and the generation adverse current.That is, the part of exhaust upstream skidding is advanced, but owing to there being the rake of inner tube, thus exhaust upstream side and central shaft skidding advance along the rake of inner tube.The exhaust of described adverse current is pushed back from the new exhaust that flows into of introduction part, thus downstream side change towards.Therefore, exhaust forms eddy current between the rake of inner tube and heater.If it is large that this eddy current becomes, enter and cause PM easily to adhere to regard to having exhaust stream between housing and the inner tube.With respect to this, by introduction part is set, the amount that the exhaust of adverse current occurs reduces, and therefore can suppress exhaust and flow between housing and the inner tube.Be attached between inner tube and the housing thereby can suppress PM, can suppress decreasing insulating.
In addition, crooked by the rake of inner tube, can further suppress exhaust and flow between inner tube and the housing.Thus, can suppress PM and be attached between inner tube and the housing, therefore can suppress decreasing insulating.So, can be suppressed between heater and the housing current flowing is arranged.
In addition, in the present invention, the rake of described inner tube also can be so that the center of curvature be positioned at the mode bending in the outside of described rake.
That is, the rake of inner tube also can more rely on upstream side more near housing.Can suppress thus to flow through the exhaust that comes through flowing between inner tube and the housing between the upstream-side-end of the rake of inner tube and the housing from the end of downstream side of introduction part.In addition, can be so that import than the inboard of inner tube by the rake of the outside position, introduction part of upstream side and housing from the exhaust of heating side adverse current, and produce eddy current.Also can suppress thus exhaust flows between inner tube and the housing.Therefore, can suppress PM and be attached between inner tube and the housing, flow via PM thereby can suppress electric current.
In addition, in the case, the upstream-side-end of the rake of described inner tube can be positioned at the tangent line position more in the outer part than the end of downstream side place of described ingress pipe.
Because exhaust is flowed to the tangential direction of the end of downstream side of ingress pipe, therefore, if the upstream-side-end of the rake of inner tube is positioned at than this tangent line position more in the outer part, the upstream-side-end of the rake of inner tube is located in the outside of exhaust stream.Thereby, can suppress exhaust through between the upstream-side-end of the rake of inner tube and the housing and flow between inner tube and the housing.
In addition, in the present invention, the rake of described inner tube also can be so that the center of curvature be positioned at the mode bending of the inboard of this rake.
That is, the rake of inner tube also can be the closer to the end just more away from housing.So, advance along the inboard of the rake of inner tube from the exhaust of heating side adverse current, advance to the direction away from housing thus.Therefore can suppress exhaust flows between inner tube and the housing.Thus, can suppress PM and be attached between inner tube and the housing, flow via PM thereby can suppress electric current.
In addition, in the case, the end of the rake of described inner tube can be positioned at the line position more in the outer part that connects than the periphery with the end of downstream side of described ingress pipe and the described liner of the inboard that is connected described inner tube.
Thus, can suppress to flow through the exhaust that comes from the end of downstream side of introduction part flows directly between inner tube and the housing.In addition, also can form introduction part, so that the exhaust that the end of downstream side along the wall of introduction part from introduction part flows in the housing is advanced to the periphery of heater or the periphery of liner that is arranged on the inboard of inner tube.In addition, the end of the rake of inner tube also can be positioned at than the end of downstream side of ingress pipe is connected the line position more in the outer part that the periphery of upstream side end face connects with heater.
The invention effect
According to the present invention, can suppress electric current and in the housing of electrical heating type catalyst, flow.
Description of drawings
Fig. 1 illustrates the figure that the summary of the electrical heating type catalyst that embodiment 1 relates to consists of;
Fig. 2 is the figure that flows that the exhaust that embodiment 1 relates to is shown;
Fig. 3 illustrates the figure that the summary of the electrical heating type catalyst that embodiment 2 relates to consists of;
Fig. 4 is the figure that flows that the exhaust that embodiment 2 relates to is shown;
Fig. 5 is another figure that flows that the exhaust that embodiment 2 relates to is shown;
Fig. 6 illustrates the figure that the summary of the electrical heating type catalyst that reference example 1 relates to consists of;
Fig. 7 illustrates the figure that the summary of the electrical heating type catalyst that reference example 2 relates to consists of.
The specific embodiment
Below, describe based on the specific embodiment of accompanying drawing to the electrical heating type catalyst that the present invention relates to.
＜embodiment 1 〉
Fig. 1 illustrates the figure that the summary of the electrical heating type catalyst 1 that the present embodiment relates to (below, be called EHC1) consists of.In addition, the EHC1 that relates to of the present embodiment is arranged on the blast pipe 2 that is installed on the internal combustion engine on the vehicle.Internal combustion engine can be diesel engine, and also can be gasoline engine.In addition, the EHC1 that relates to of the present embodiment also can be used in the vehicle that has adopted the hybrid power system that possesses electro-motor.
EHC1 shown in Figure 1 is along this EHC1 of central shaft A longitudinally cutting of this EHC1 and the profile that gets.The shape of EHC1 is symmetrical with respect to central shaft A line, therefore only shows the part of the upside of EHC1 in Fig. 1.In addition, the shape in the downstream of EHC1 can be and the shape of the shape symmetry of upstream side, also can be and in the past identical shape therefore to omit diagram.In addition, in Fig. 1, the arrow of symbol B represents the flow direction of exhaust.
The EHC1 that the present embodiment relates to comprises the columniform catalyst carrier 3 centered by central shaft A.And, from central shaft A side, comprise successively catalyst carrier 3, inner tube 4, housing 5.And, be provided with liner 6 between catalyst carrier 3 and the inner tube 4 and between inner tube 4 and the housing 5.
Thereby catalyst carrier 3 is used and is become resistance by being energized the material that generates heat.The material of catalyst carrier 3 for example uses SiC.Catalyst carrier 3 has that flow direction B (also can be the direction of central shaft A) along exhaust extends and the section vertical with the flow direction of exhaust consists of a plurality of paths of honeycomb shape.Exhaust is flowed in this path.The profile of catalyst carrier 3 for example is cylindrical centered by the central shaft A of blast pipe 2.In addition, the section shape of the section vertical with central shaft A of catalyst carrier 3 for example can be ellipse, also can be polygon.Central shaft A is the common central shaft of blast pipe 2, catalyst carrier 3, inner tube 4 and housing 5.In the present embodiment, catalyst carrier 3 is equivalent to the heater among the present invention.In the situation that more arrange in the heater of heater by upstream side than catalyst, also can similarly use the present embodiment.
Catalyst is carried on the catalyst carrier 3.Catalyst is such as enumerating oxidation catalyst, three-way catalyst, absorbing and reducing type NOx catalyst, selective reduction type NOx catalyst etc.Catalyst carrier 3 is connected with pair of electrodes 7, and by apply voltage between this electrode 7, catalyst carrier 3 is energized.By the resistance of this catalyst carrier 3, these catalyst carrier 3 heatings.
The material of inner tube 4 for example can use the such electrical insulator of aluminium.In addition, inner tube 4 also can be the parts that applied electrical insulator on the surface of the electric conductors such as metal.Inner tube 4 comprises rake 41 and tube 42 successively from upstream side.Rake 41 tilts with respect to central shaft A with regard to less mode according to more relying on its internal diameter of upstream side.Upstream-side-end 44 openings of rake 41, the interior side inflow of exhaust from this upstream-side-end 44 to inner tube 4.In addition, the end of downstream side of rake 41 is connected with the upstream-side-end of tube 42.In addition, the border of rake 41 and tube 42 is positions of inner tube 4 bendings, below is called kink 43.
And, near the upstream-side-end 44 of the rake 41 of inner tube 4 so that the center of curvature to be positioned at the mode in the outside of inner tube 4 crooked.That is, at the upstream side of kink 43, the sectional area of rake 41 reduces gradually, but near upstream-side-end 44, more relies on upstream side, and the degree that sectional area reduces is less.This also can say and be the outside curve to inner tube 4.And, can say that also gradient for the tangent line of the rake 41 of inner tube 4 more relies on upstream side less.So, the rake 41 of inner tube 4 more relies on upstream side just more near housing 5.In addition, near the sectional area of the rake 41 the kink 43 can reduce with fixing degree along with relying on upstream side, also can more rely on upstream side as near upstream side end 44, the degree that near the sectional area of the rake 41 the kink 43 reduces is just less.
The material of housing 5 can use metal, for example can use stainless steel.This housing 5 also can be used as the outer tube of bimetallic tube.And, have the hole on the housing 5, be used for electrode 7 is passed through, between housing 5 and electrode 7, be provided with interval to a certain degree, in order to avoid cause discharge.And, in the hole of opening on housing 5, be provided with the insulation division 8 that supports electrode 7.The materials'use electrical insulator of this insulation division 8.And insulation division 8 seamlessly is arranged between housing 5 and the electrode 7.
It includes oral area 51, rake 52 and tube 53 to housing 5 successively from upstream side.Rake 52 tilts with respect to central shaft A more to rely on the larger mode of its internal diameter of downstream.The upstream-side-end of rake 52 is connected with inlet portion 51.The upstream-side-end of the inlet portion 51 of housing 5 is formed with flange, and is connected with blast pipe 2.Inlet portion 51 openings, exhaust is via the interior side inflow of this inlet portion 51 to housing 5.And the end of downstream side of the rake 52 of housing 5 is connected with the upstream-side-end of tube 53.The rake 52 of housing 5 also can with the part of the rake 41 of inner tube 4 and near the partial parallel of kink 43.
The tube 53 of housing 5 forms the tubulose centered by central shaft A.The tube 53 of housing 5 is made of the curved surface parallel with central shaft A.
In addition, the connecting portion between the rake 52 of the inlet portion 51 of the side introduction part 54 of extending and housing 5 and housing 5 is connected downstream.Introduction part 54 comprises the rake 541 of upstream side and the bend 542 in downstream.
The rake 541 of introduction part 54 tilts with respect to central shaft A with regard to larger mode more to rely on its sectional area of downstream.And the rake 541 of introduction part 54 is along with relying on the downstream, and sectional area increases with fixing ratio.In the present embodiment, from inlet portion 51 begin to tilt midway, but also can replace, begin to tilt from the upstream-side-end of introduction part 54.
On the other hand, the bend 542 of introduction part 54 is so that the center of curvature is positioned at the mode bending in the outside of introduction part 54.That is, the bend 542 of introduction part 54 is along with relying on the downstream, and its sectional area increases gradually, and more relies on the downstream, and the degree that its sectional area increases is just larger.This also can say and be laterally bending of introduction part 54.In addition, can say that also gradient for the tangent line of introduction part 54 more relies on the downstream just larger.
In addition, the rake 41 of introduction part 54 and inner tube 4 is formed: so that the upstream-side-end 44 of the rake 41 of inner tube 4 is positioned at the tangent line position more in the outer part than the end of downstream side 543 of introduction part 54.That is, when exhaust was tangentially advanced from the end of downstream side 543 of introduction part 54, this exhaust was flowed in the position that the upstream-side-end 44 than the rake 41 of inner tube 4 more relies on central shaft A side.In addition, the distance L 1 between the rake 41 of the end of downstream side 543 of introduction part 54 and inner tube 4 is set to the distance that can suppress discharge to catalyst carrier 3 energising the time.Similarly, the distance L 2 between the rake 41 of the rake 52 of housing 5 and inner tube 4 is set to the distance that can suppress discharge to catalyst carrier 3 energising the time.And these distance L 1, L2 can wait acquisition by experiment.
The external diameter of this liner 6 when being wrapped in liner 6 on the catalyst carrier 3 is greater than the internal diameter of inner tube 4.Therefore, when liner 6 being received into inner tube 4 when interior, this liner 6 is compressed, and therefore by the reaction force of this liner 6, catalyst carrier 3 is fixed in the inner tube 4.
The external diameter of this liner 6 when in addition, being wrapped in liner 6 on the inner tube 4 is greater than the internal diameter of housing 5.Therefore, when liner 6 being received into housing 5 when interior, this liner 6 is compressed, and therefore by the reaction force of this liner 6, inner tube 4 is fixed in the housing 5.In addition, upstream side and downstream are outstanding from liner 6 for inner tube 4.
In the present embodiment, be divided into than electrode 7 with liner 6 and more be illustrated by the part of upstream side with by the example of the part in downstream, but these liners 6 also can except electrode 7 on every side, the part of upstream side and the part in downstream are integrally formed.
At this, in the present embodiment, it is just larger that the sectional area of introduction part 54 more relies on the downstream, therefore can make exhaust to wide scope diffusion.Thus, exhaust inflow catalyst carrier 3 equably.In addition, as shown in Figure 2, can reduce the eddy current that occurs in the zone than catalyst carrier 3 top trips.At this, Fig. 2 is the figure that flows that the exhaust that the present embodiment relates to is shown.The arrow of with dashed lines or double dot dash line shows the flow direction of exhaust.
After the part of the exhaust that flows into from introduction part 54 and the upstream side end face collision of catalyst carrier 3, mobile to the outer circumferential side of this catalyst carrier 3 along the upstream side end face of this catalyst carrier 3.Tube 42 collision of this exhaust and inner tube 4 is then along inner tube 4 side adverse current upstream.And because the rake 41 of inner tube 4 to central shaft A inclination tiltedly, so exhaust is pushed back from the introduction part 54 new exhausts that import after upstream side and central shaft A skidding advance.Thus, among the space C between the rake 41 of catalyst carrier 3 and inner tube 4, exhaust forms eddy current.
If the sectional area of supposition introduction part 54 until fix till the end of downstream side 543, then has near the central shaft that a large amount of exhausts collides catalyst carrier 3, the amount of the exhaust of therefore advancing along the upstream side end face of this catalyst carrier 3 can increase.Thus, form large eddy current among the space C between the rake 41 of catalyst carrier 3 and inner tube 4.On the other hand, if as the present embodiment the sectional area of introduction part 54 more to rely on the downstream larger, then exhaust is to wide scope diffusion, the eddy current that therefore occurs diminishes.
At this, the eddy current that occurs among the space C between the rake 41 of catalyst carrier 3 and inner tube 4 is larger, and exhaust just more easily flow between housing 5 and the inner tube 4.Therefore, by the eddy current that reduces to occur among the space C between the rake 41 of catalyst carrier 3 and inner tube 4, can reduce to flow into the amount of the exhaust between inner tube 4 and the housing 5.Can suppress thus PM is attached between inner tube 4 and the housing 5.
In addition, because the upstream-side-end 44 of inner tube 4 is positioned at the tangent line position more in the outer part than end of downstream side 543 places of introduction part 54, the exhaust that therefore 4 rake 41 is advanced from introduction part 54 to inner tube is collided with the wall of the inboard of the rake 41 of inner tube 4 shown in double dot dash line M like that.This exhaust is followed among the space C between the rake 41 of inflow catalyst carrier 3 and inner tube 4.That is, can suppress exhaust flows to the represented direction of E.
In addition, because near rake 52 bendings to housing 5 of the upstream-side-end 44 of inner tube 4, so the distance L 2 between the rake 52 of the upstream-side-end 44 of inner tube 4 and housing 5 is shorter.Thus, exhaust is difficult to flow between inner tube 4 and the housing 5.And the part of the exhaust of adverse current is advanced along the inwall of the rake 41 of inner tube 4 with catalyst carrier 3 collisions.Thus, exhaust can be imported among the space D between the rake 52 of introduction part 54 and housing 5.That is, can suppress exhaust flows to the represented direction of F.And, owing to can in the D of this space, produce the eddy current of exhaust, therefore can suppress exhaust and flow between inner tube 4 and the housing 5.
In the present embodiment, the upstream-side-end 6A of liner 6 and kink 43 also can predetermined distance apart L3.That is, the outer peripheral face of the tube 42 of inner tube 4 also can lean on the position of upstream side to expose at the upstream-side-end 6A than liner 6.
At this, the exhaust that flow between inner tube 4 and the housing 5 is flowed along rake 41.This exhaust also will be advanced to the direction of the extended line of rake 41 at kink 43.Therefore, flowing of exhaust left from the outer peripheral face of the tube 42 of inner tube 4.So exhaust does not directly contact being positioned at than kink 43 by the downstream and than the upstream-side-end 6A of liner 6 outer peripheral face by the tube 42 of the position of upstream side of inner tube 4.So, because not directly contact of exhaust, so PM is difficult to be attached to this position.That is, by upstream-side-end 6A and the kink 43 predetermined distance apart L3 that make liner 6, can suppress on the outer peripheral face that PM is attached to the inner tube 4 between them.Preset distance L3 for example is the distance that can suppress the creeping discharge between the upstream-side-end 6A of kink 43 and liner 6, can wait by experiment and obtain optimum value.
And, even PM is attached to the rake 41 of inner tube 4, as long as PM is not attached to the outer peripheral face of the tube 42 of inner tube 4, just can suppresses electric current and flow between catalyst carrier 3 and housing 5 via PM.That is, because at least surface of inner tube 4 is electrical insulator, therefore just do not have current flowing as long as no adhering to PM.
As mentioned above, in the present embodiment, can reduce the amount of the exhaust of between inner tube 4 and housing 5, flowing, therefore can suppress PM and be attached between inner tube 4 and the housing 5.Can suppress thus electric current flowing via PM.
＜embodiment 2 〉
Fig. 3 illustrates the figure that the summary of the EHC1 that the present embodiment relates to consists of.Difference from Example 1 is described.At this, in embodiment 1, the upstream-side-end 44 of the rake 41 of inner tube 4 is crooked to the direction near the rake 52 of housing 5, but in the present embodiment, and the upstream-side-end 44 of the rake 41 of inner tube 4 is crooked to the direction away from the rake 52 of housing 5.
That is, in the present embodiment, near the upstream-side-end 44 of the rake 41 of inner tube 4 so that the center of curvature to be positioned at the mode of inboard of inner tube 4 crooked.And it is just less that the sectional area of the rake 41 of inner tube 4 more relies on upstream-side-end 44 sides.And, more relying on upstream-side-end 44 sides, the rake 41 of inner tube 4 is just longer with the distance of the rake 52 of housing 5.This also can say and be the inside bend to inner tube 4.The upstream-side-end 44 of inner tube 4 also can be towards catalyst carrier 3 sides.That is, at the rake 41 of inner tube 4, also can have direction and the rectangular position of central shaft A of tangent line.Near the kink 43 rakes 41 can reduce with fixing degree along with relying on its sectional area of upstream side, also can be such as upstream side end 44 neighbouring like that, more rely on the degree that its sectional area of upstream side reduces just larger.
At this, Fig. 4 is the figure that flows that the exhaust that the present embodiment relates to is shown.The with dashed lines arrow shows the flow direction of exhaust.In the present embodiment, introduction part 54 rake 41 of being connected with inner tube is formed: so that the upstream-side-end 44 of inner tube 4 is positioned at the line G position more in the outer part that is connected with the periphery of the upstream-side-end 6A of the liner 6 that is arranged on inner tube 4 inboards than the end of downstream side 543 with introduction part 54.Thus, can suppress exhaust flow between inner tube 4 and the housing 5.Also can form the rake 41 of introduction part 54 and inner tube 4, so that the upstream-side-end 44 of inner tube 4 is positioned at the line position more in the outer part than the upstream-side-end connection of the periphery that the end of downstream side 543 of introduction part 54 is connected with catalyst carrier.
In the EHC1 that so consists of, the exhausts in the end of downstream side 543 inflow housings 5 of introduction part 54 are spread in the mode away from central shaft A.But, from the end of downstream side 543 of introduction part 54 in the shorter situation of the distance of catalyst carrier 3, exhaust is difficult to diffusion.In the case, owing to the exhaust that the end of downstream side 543 from introduction part 54 flows into is suppressed to the diffusion of inner tube 4 sides, therefore can suppresses exhaust and flow to upstream-side-end 44 zone more in the outer part than inner tube 4.
In addition, because the upstream-side-end 44 of inner tube 4 to central shaft A lateral bend, when therefore the exhaust stream of adverse current is near upstream-side-end 44 when colliding with catalyst carrier 3, easily produces the eddy current of direction shown in Figure 4.That is, eddy generation among the space C between the rake 41 of catalyst carrier 3 and inner tube 4.And, can suppress to flow through the exhaust that comes from the end of downstream side 543 of introduction part 54 mobile along the rake 41 of inner tube 4.Thus, easily produce eddy current among the space C between the rake 41 of catalyst carrier 3 and inner tube 4.Thus, also can suppress exhaust flow between inner tube 4 and the housing 5.
In addition, as shown in Figure 5, also can expect the situation in the not eddy generation of inboard of the rake 41 of inner tube 4.At this, Fig. 5 is another figure that flows that the exhaust that the present embodiment relates to is shown.Shown in H, downstream in the situation of side flow, be difficult to produce eddy current among the space C between the rake 41 of catalyst carrier 3 and inner tube 4 along the inner peripheral surface of the tube 42 of inner tube 4 from upstream side in exhaust.But, owing to increase in the density of the inner peripheral surface vicinity exhaust of the tube 42 of inner tube 4, so the upstream side end face of exhaust such as catalyst carrier that J is shown in 3 is to mobile towards the direction of central shaft A.Thus, can suppress exhaust flow between inner tube 4 and the housing 5.
As mentioned above, in the present embodiment, owing to can reduce the amount of the exhaust of between inner tube 4 and housing 5, flowing, therefore can suppress PM and be attached between inner tube 4 and the housing 5.Thus, can suppress electric current flowing via PM.
＜reference example 1 〉
Fig. 6 illustrates the figure that the summary of the EHC1 that this reference example relates to consists of.Difference from Example 1 is described.In addition, in Fig. 6, dotted line represents flowing of exhaust.
In this reference example, be constituted as and comprise: more rely on just less downstream rake 411 of upstream side sectional area from the kink 43 of inner tube 4; From this downstream rake lateral bend and towards the bends 412 that change 180 degree upstream; From this bend 412 upstream side rake 413 of extending of side and the outside downstream; And from upstream side rake 413 and the central shaft A reflex part 414 that extends of side downstream abreast.The end of downstream side of reflex part 414 is made as the end 415 of inner tube 4.
At this, downstream rake 411 and upstream side rake 413 can form abreast.In addition, in the present embodiment, reflex part 414 is positioned on the extended line of tube 42 of inner tube 4.
That is, the inner tube 4 that this reference example relates at downstream rake 411 after the upstream side sectional area reduces gradually, crooked laterally at bend 412, then at upstream side rake 413 towards the downstream and the outside.And, between the end 415 of inner tube 4 and kink 43, be provided with distance.
Be formed with space K in the inner tube 4 that so consists of, space K is surrounded by downstream rake 411, bend 412, upstream side rake 413, and between the end 415 of inner tube 4 and kink 43 opening.
In addition, introduction part 54 is formed the pipe parallel with central shaft A.And, compare with embodiment 1, prolong the end of downstream side 543 of introduction part 54 and the distance L 1 of inner tube 4, and prolonged the distance L 2 of inner tube 4 with the rake 52 of housing 5.In addition, similarly to Example 1, introduction part 54 also can be crooked.
In addition, the kink 43 of inner tube 4 be arranged on liner 6 upstream-side-end 6A near.
In the EHC1 that so consists of, by enlarging the distance of inner tube 4 and housing 5, become easy for the management of manufacture deviation.But exhaust easily flow between inner tube 4 and the housing 5, therefore easily adheres to PM.
To this, it is crooked at bend 412 180 degree to occur by inner tube 4, exhaust is difficult to flow among the described space K.Thereby PM is difficult to be attached on the wall that forms this space K, therefore can guarantee insulating properties.
In addition, because the sectional area of introduction part 54 do not change, even therefore after housing 5 is assembled, also introduction part 54 can be installed from behind.The management of manufacture deviation becomes easy thus.
In addition, owing in inner tube 4, facing the area reducing of catalyst carrier 3, therefore can suppress the drop in temperature of exhaust.Thus, can promote the temperature of catalyst carrier 3 to raise.
In addition, by the kink 43 of inner tube 4 is set near liner 6, therefore the downstream rake 411 of inner tube 4 and the Distance Shortened of catalyst carrier 3 can improve the temperature of inner tube 4.Can promote to be attached to thus the oxidation of the PM on the inner tube 4.
＜reference example 2 〉
Fig. 7 illustrates the figure that the summary of the EHC1 that this reference example relates to consists of.To describing with reference example 1 difference.In addition, in Fig. 7, dotted line represents flowing of exhaust.
The difference of the EHC1 that this reference example relates to and reference example 1 is, reflex part 414 is positioned at than the extended line of the tube 42 of inner tube 4 more by the position of central shaft A side.That is, so that upstream side rake 413 does not arrive the extended line of the tube 42 of inner tube 4.And reflex part 414 is in front and the abreast downstream side extension of central shaft A of the extended line of the tube 42 of inner tube 4.
In addition, the kink 43 of inner tube 4 arranges away from the liner 6 in the outside of inner tube 4.
In the EHC1 that so consists of, flow into exhaust between inner tube 4 and the housing 5 along the wall of housing 5 side flow downstream, and arrive to liner 6.Then, the exhaust that collision has occured with liner 6 is along the outer peripheral face of the tube 42 of inner tube 4 side flow upstream.At this moment, because the end 415 of inner tube 4 is positioned at than the extended line of the tube 42 of inner tube 4 more by the position of central shaft A side, so exhaust does not flow among the described space K but flows through the wall direction of the rake 52 of the lateral housing 5 of the end 415 of inner tube 4.Therefore, can suppress exhaust and flow among the described space K, can suppress thus PM and flow among the K of this space.Thereby PM is difficult to be attached to the wall on every side of this space K, therefore can guarantee insulating properties.
Symbol description
Claims (5)
1. electrical heating type catalyst comprises:
Heater, this heater generates heat by being energized;
Housing, this housing holds described heater;
Liner, this liner are arranged between described housing and the described heater, and support described heater; And
Inner tube, this inner tube is outstanding by described liner clamping and the upstream side from described liner to exhaust flow and downstream, and described inner tube electric insulation;
Wherein, described housing comprises: tube, and this tube is arranged on the outer circumferential side of described heater, and forms with the central axes of described heater ground; Inlet portion, this inlet portion are arranged on the position of more leaning on upstream side than described tube, and the internal diameter of described inlet portion is less than the internal diameter of described tube; Rake, this rake connect described tube and described inlet portion, and more rely on the downstream, and the sectional area of described rake is just larger; And introduction part, extend the inboard of this introduction part from the connecting portion between described inlet portion and the described rake to described housing,
Described introduction part so that the center of curvature to be positioned at the mode in the outside of described introduction part crooked,
Described inner tube comprises: tube, and this tube is arranged on the outer circumferential side of described heater, and forms with the central axes of described heater ground; And rake, this rake is arranged on than described tube and more leans on the position of upstream side, and more relies on upstream side, and the internal diameter of described rake is just less,
The rake of described inner tube is crooked.
2. electrical heating type catalyst as claimed in claim 1, wherein,
The rake of described inner tube is so that the center of curvature is positioned at the mode bending in the outside of described rake.
3. electrical heating type catalyst as claimed in claim 2, wherein,
The upstream-side-end of the rake of described inner tube is positioned at the tangent line position more in the outer part than the end of downstream side place of described ingress pipe.
4. electrical heating type catalyst as claimed in claim 1, wherein,
The rake of described inner tube is so that the center of curvature is positioned at the mode bending of the inboard of described rake.
5. electrical heating type catalyst as claimed in claim 4, wherein,
The end of the rake of described inner tube is positioned at the line position more in the outer part that connects than the periphery with the end of downstream side of described ingress pipe and the described liner of the inboard that is connected described inner tube.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| PCT/JP2012/050482 WO2013105246A1 (en) | 2012-01-12 | 2012-01-12 | Electrically heated catalyst |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN103313773A true CN103313773A (en) | 2013-09-18 |
| CN103313773B CN103313773B (en) | 2016-01-13 |
Family
ID=48780094
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201280000396.9A Active CN103313773B (en) | 2012-01-12 | 2012-01-12 | Electrically heated catalyst |
Country Status (5)
| Country | Link |
|---|---|
| US (1) | US8741224B2 (en) |
| EP (1) | EP2803402B1 (en) |
| JP (1) | JP5418680B2 (en) |
| CN (1) | CN103313773B (en) |
| WO (1) | WO2013105246A1 (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105545428A (en) * | 2014-10-28 | 2016-05-04 | 揖斐电株式会社 | Electrically heated catalytic converter |
| CN106194348A (en) * | 2015-05-25 | 2016-12-07 | 本田技研工业株式会社 | The waste gas purification apparatus of internal combustion engine |
| CN111868360A (en) * | 2018-03-15 | 2020-10-30 | 株式会社电装 | Electrically heated catalyst |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102014006761A1 (en) * | 2013-06-21 | 2014-12-24 | Modine Manufacturing Company | exhaust gas cooler |
| JP2015148204A (en) * | 2014-02-07 | 2015-08-20 | トヨタ自動車株式会社 | Exhaust emission control catalyst converter device |
| JP6408865B2 (en) * | 2014-10-28 | 2018-10-17 | イビデン株式会社 | Electric heating type catalytic converter |
| JP6370192B2 (en) * | 2014-10-28 | 2018-08-08 | イビデン株式会社 | Electric heating type catalytic converter |
| JP7363725B2 (en) | 2020-09-18 | 2023-10-18 | トヨタ自動車株式会社 | catalytic device |
| JP2023153607A (en) * | 2022-04-05 | 2023-10-18 | トヨタ自動車株式会社 | Catalyst device |
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| JPH05231140A (en) * | 1992-02-18 | 1993-09-07 | Mitsubishi Motors Corp | Exhaust emission control device |
| US5839276A (en) * | 1995-02-02 | 1998-11-24 | Nissan Motor Co., Ltd. | Engine catalytic converter |
| JP2008014186A (en) * | 2006-07-04 | 2008-01-24 | Toyota Motor Corp | High voltage supply apparatus |
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| JPH05269387A (en) * | 1992-03-26 | 1993-10-19 | Nissan Motor Co Ltd | Exhaust gas purifying catalystic converter |
| DE19711789C2 (en) * | 1997-03-21 | 2000-05-25 | Zeuna Staerker Kg | Motor vehicle exhaust gas purification device and method for its production |
| US7238327B2 (en) * | 2002-12-10 | 2007-07-03 | Automotive Components Holdings, Llc | Method of attaching internal heat shield in automotive catalytic converters |
| US7462332B2 (en) * | 2003-06-18 | 2008-12-09 | Delphi Technologies, Inc. | Apparatus and method for manufacturing a catalytic converter |
| US20050036923A1 (en) * | 2003-07-31 | 2005-02-17 | Brisbin Ronald S. | End cone construction for catalytic converters and method for making same |
| WO2011121710A1 (en) | 2010-03-29 | 2011-10-06 | トヨタ自動車株式会社 | Catalyst converter device |
| WO2011128996A1 (en) * | 2010-04-14 | 2011-10-20 | トヨタ自動車株式会社 | Electrically-heated catalyst and manufacturing method therefor |
| JP5316707B2 (en) * | 2011-03-10 | 2013-10-16 | トヨタ自動車株式会社 | Exhaust gas purification device for internal combustion engine |
-
2012
- 2012-01-12 WO PCT/JP2012/050482 patent/WO2013105246A1/en active Application Filing
- 2012-01-12 EP EP12724533.0A patent/EP2803402B1/en active Active
- 2012-01-12 CN CN201280000396.9A patent/CN103313773B/en active Active
- 2012-01-12 US US13/515,374 patent/US8741224B2/en active Active
- 2012-01-12 JP JP2012526777A patent/JP5418680B2/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH05231140A (en) * | 1992-02-18 | 1993-09-07 | Mitsubishi Motors Corp | Exhaust emission control device |
| US5839276A (en) * | 1995-02-02 | 1998-11-24 | Nissan Motor Co., Ltd. | Engine catalytic converter |
| JP2008014186A (en) * | 2006-07-04 | 2008-01-24 | Toyota Motor Corp | High voltage supply apparatus |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105545428A (en) * | 2014-10-28 | 2016-05-04 | 揖斐电株式会社 | Electrically heated catalytic converter |
| CN105545428B (en) * | 2014-10-28 | 2018-11-30 | 揖斐电株式会社 | Electrical heating type catalytic converter |
| CN106194348A (en) * | 2015-05-25 | 2016-12-07 | 本田技研工业株式会社 | The waste gas purification apparatus of internal combustion engine |
| CN106194348B (en) * | 2015-05-25 | 2019-03-15 | 本田技研工业株式会社 | The waste gas purification apparatus of internal combustion engine |
| CN111868360A (en) * | 2018-03-15 | 2020-10-30 | 株式会社电装 | Electrically heated catalyst |
Also Published As
| Publication number | Publication date |
|---|---|
| EP2803402A4 (en) | 2015-03-11 |
| EP2803402A1 (en) | 2014-11-19 |
| US20130183205A1 (en) | 2013-07-18 |
| US8741224B2 (en) | 2014-06-03 |
| EP2803402B1 (en) | 2016-05-11 |
| WO2013105246A1 (en) | 2013-07-18 |
| JP5418680B2 (en) | 2014-02-19 |
| JPWO2013105246A1 (en) | 2015-05-11 |
| CN103313773B (en) | 2016-01-13 |
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